Graded Filter-Separator for Wellbore Debris Flow Control
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Solution Overview
Problem
Existing debris collection tools face issues with debris adhering to filters, leading to restricted fluid flow, incomplete chamber filling, and increased power requirements due to clogging, especially in deviated wellbores.
Innovation Solution
A collecting device with an elongated filter having varying permeabilities along its length, a duckbill valve inlet, and a design that allows for self-cleaning, combined with a flexible elongated filter position to optimize debris collection and fluid flow, ensuring complete chamber filling and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elongated filter is used to separate debris from fluid in a collecting chamber, then debris separation efficiency is improved, but the filter becomes clogged by adhering debris near the inlet, restricting fluid flow and preventing complete chamber filling
Solution Approach 1:
The filter is designed with varying permeability along its length, with the first portion (near inlet) having higher permeability and the second portion (farther from inlet) having lower permeability. This local quality variation allows the inlet region to handle high debris loads without clogging while the outlet region provides fine filtration, resolving the contradiction between separation efficiency and chamber filling completeness.
2Quantity of substance
If the filter is positioned to maximize debris collection, then debris capture is improved, but fluid flow through the filter is restricted due to clogging, increasing power requirements
Solution Approach 1:
The gradient in permeability along the filter length creates regions optimized for different functions: the high-permeability inlet region minimizes pressure drop and power consumption while capturing debris, and the low-permeability outlet region ensures complete filtration. This resolves the contradiction between debris capture quantity and power consumption.
3Ease of manufacture
If a uniform permeability filter is used, then manufacturing is simplified, but debris adhesion at the inlet causes clogging and restricts fluid flow to unclogged portions
Solution Approach 1:
The filter incorporates varying permeability along its length, with the first portion having higher permeability than the second portion. This design accepts increased manufacturing complexity but resolves the productivity issue by preventing inlet clogging while maintaining effective filtration throughout the filter length.
Solution Approach 2:
The permeability parameter of the filter is deliberately varied along its length rather than kept uniform. This parameter change allows the filter to handle the contradiction between manufacturing simplicity and fluid flow productivity by creating a gradient structure that prevents clogging at the inlet while maintaining filtration efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances debris collection efficiency by minimizing clogging, optimizing fluid flow, and adapting to different wellbore conditions, thereby improving production efficiency and reducing downtime.
Implementation Method 1
an elongated filter, the elongated filter extends along the device longitudinal central axis and forms a first end portion and an opposite second end portion
Implementation Method 2
the elongated filter at the first end portion is formed with a first permeability and the elongated filter at the second end portion is formed with a second permeability
Data Source
AI summary
A collecting device for collecting debris within a wellbore, the collecting device comprises a leading portion, a trailing portion, a wall connecting the leading portion to the trailing portion, a collecting chamber on an inside of the wall, an inlet at the leading portion, an outlet at the trailing portion, and an elongated filter, the collecting device forms a device longitudinal central axis, wherein the elongated filter extends along the central axis and forms a first end portion and a second end portion, wherein the first end portion has a first permeability and the second end portion has a second permeability, the second end portion is positioned closest to the inlet, the elongated filter forms a retentate side and permeate side. A downhole toolstring and a method for collecting the debris from the wellbore are also disclosed.